Because so many of these points are demeaning, right? Practically everyone I've ever met uses "you guys" in place of "you all", etc, with no derogatory intent. Certainly anyone familiar with the western US would realize and understand this. My mom and dad are both technically illiterate, and I gladly use both as examples. I would never assume a woman is non-technical _at a technical conference_, but everywhere else in the country the average woman is far less likely to be in a technical career than the average man, by simple probability. IT IS UNUSUAL.
Making assumptions about individuals based on your interpretation of statistics about their gender is inherently sexist. Most of us do it, but that doesn't make it less harmful.
